Fine and good but they aren't the characters the kids recognize -- aren't on the t-shirts and bookbags.
When I was a kid my favorite comics included the Midnight Sons, especially the Blade, Ghost Rider (Danny), Johnny Blaze, Hannibal King, Frank Drake, and Dr Strange. None of them were on book bags, and I care they were still my favorites. Iron Man has been my 3rd favorite hero since I was like 7 or 8 and he wasn't exactly all over the cartoons and movies until the last few years.
Kids like what they like, and if you expose them to lesser known characters, they might just like lesser known characters even though they can't get toys and bags with them. My daughter loves Booster Gold, Blue Beetle (Jaime), Marvel's Hercules, and a bunch of other characters that her friends at school have probably never heard of. The reason for that is comics like Marvel Adventures (there's a great Hercules story in one of the Iron Man/Spider-Man/Hulk books), and shows like JLU and Batman: The Brave and the Bold that have exposed her to lesser known characters.
It's not about knowing the characters before they read the books, it's about reading the books and getting to know the characters and then picking what you like based on that. I'd bet most people, kids or adults, that read something like Bone have no knowledge of those characters before picking up volume 1.